Itsme64's 1.20 Themed GUI V2 [1.2.1] is a release file of the Minecraft resource pack The Unnamed Update (1.20) Themed GUI, made for Minecraft 1.19.3. It was published on January 10, 2023 and is 1.5 MB in size. For the full description, screenshots and every other version, visit the The Unnamed Update (1.20) Themed GUI resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.